When the alternator cannot supply adequate power or is completely dead at low RPM, it is mostly because of a damaged voltage regulator. There could be two reasons for the malfunctioning alternator : A faulty voltage regulator A reading less than 12 volts will cause the battery light on in car. Checking the device with a multimeter should show a reading between 13.6 to 14.6 volts.

The device keeps the battery charged up and supplies power to the electrical components when the engine is running. If the battery checks out fine, you should move into the alternator. If the battery is bad, you should go for one of the best car battery units to avoid this problem in the future. In that case, the voltage will drop, causing the battery light on dashboard to come on.Ĭleaning the terminals is the primary solution but replacement of the terminal ends is the best option when a clean-up does not work. It could have corroded or dirty terminals that cannot transmit the power from the battery or bad cell that is unable to receive charging. The first thing you should check is whether there is a problem with the battery. There could be several reasons for the car battery light on while you are driving.

The battery warning lights indicate the poor condition of the battery. Total failure of the alternator could be the reason too and it’s a more expensive fix than replacing the car battery. If the battery light came on while driving and stays on, a broken alternator belt is the most likely culprit. The light only indicates a charging problem. The battery light came on had the voltage been dropped. There is a circuit that can count the voltage produced by the alternator. Each car has an indicator light on the dashboard that warns when the battery fails to recharge. The battery is the exclusive power source behind many functions in a vehicle. Battery Light On In Car: The Working Mechanism So, it’s important to know if there is anything concerning when the battery light on in car. But, what does it mean when the battery light comes on ? The battery is vital to the operation of a vehicle. Every car these days has a rechargeable 12-volt battery that powers up all the electrical components – the engine control unit (ECU), headlights, radio, ignition system, and other accessories.

Car battery indicator clear